Some of the physical markers that have led scientists to identify certain early fossils as hominins rather than apes are features that have been lost during subsequent human evolution. One example is: Multiple choice question. tree-climbing ability. ambidexterity. big back teeth. increase in brain size.

Answer:

Explanation:

Skin is the first line of defense against various harmful activity due to contact with grit, microbes, or harmful chemicals. Sweat produces from sweat glands deters microbes from over colonizing the skin surface by producing dermicidin, which has antibiotic properties prevention infection.

The body has Heat and cold receptors are located in the skin. When the body temperature rises, the hypothalamus in the brain sends a nerve signal to skin glands that produces sweat and they release 1-2 liters of water per hour this cools the body.

The hypothalamus also beings about dilation of the blood vessels of the skin, this allow more blood to flow into those areas with high temperature causing the heat to be convected away from the skin surface.

Answer:

Graph B

Explanation:

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8. A single or double letter genetic code would limit the number of possible variations in the genetic code. 9. A 4-letter code would require a larger number of nucleotides in the genome.

Variations in the genetic code, would ultimately lead to a limited range of proteins being produced. This would severely limit the organism's ability to adapt to its environment and evolve over time. Additionally, a single or double letter code would make it difficult to differentiate between different amino acids, as there would be less unique combinations of letters available.

On the other hand, a 4-letter genetic code would result in too many possible combinations, which could lead to errors in transcription or translation. This would result in the production of non-functional or even harmful proteins. Additionally, a 4-letter code would require a larger number of nucleotides in the genome, which would increase the size and complexity of the organism's genetic material. Overall, a balanced and efficient genetic code with a moderate number of letters is necessary for the proper functioning and evolution of an organism.

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A genetic code of one or two letters would not be efficient or practical for encoding the information needed to produce proteins in living organisms. A 4-letter genetic code would increase the number of possible instructions that could be encoded, however, it would also increase the potential for errors and mutations.

A genetic code of one or two letters would severely limit the number of possible instructions that could be encoded. This would result in a lack of diversity in the proteins that could be produced, which could be detrimental to the survival of the organism.

On the other hand, a 4-letter genetic code would increase the number of possible instructions that could be encoded. However, it would also increase the potential for errors and mutations. This is because there would be more opportunities for the wrong letter to be incorporated into the DNA sequence, leading to changes in the resulting protein.

In addition, a 4-letter genetic code would require more complex machinery to translate the DNA sequence, which would be energetically costly for the organism. Therefore, a 4-letter genetic code may not be advantageous in terms of efficiency and accuracy.

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Answer:

The correct answer is B. "Melanocytes and muscle cells express different genes."

Although all cells in an organism (such as a human) contain the same DNA, different cell types express different sets of genes. Gene expression is the process by which specific genes are activated to produce a needed protein. In this case, the gene responsible for melanin production is expressed in melanocytes, but not in muscle cells.

This does not mean that muscle cells have destroyed the gene for melanin (as stated in option C) or that melanocytes contain different genes from muscle cells (as stated in option D). All cells within an organism contain the same genes, but not all genes are expressed in every cell. The process of gene expression is regulated by the cell to ensure that each cell type functions properly.

Option A is also incorrect because all cells, including both muscle cells and melanocytes, rely on both DNA (for storing genetic information) and RNA (for transmitting that information and producing proteins). DNA is transcribed into RNA, which is then translated into proteins. This process occurs in all cells.

The statement explains the difference between skin melanocytes and muscle cells is - melanocytes and muscle cells express different genes. So option b  is correct.

Melanocytes are dark, dendritic-shaped, highly differentiated cells that secrete melanin, a pigment found in melanosomes, which is the primary function of melanocytes.

Melanocytes are a type of cell derived from the neural crest. They form a synapse with keratinocytes through their dendrites in the epidermis. Melanocytes play an important part in skin pigmentation and their role in the generation and distribution of melanin has been extensively studied.

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Answer:

20N

Explanation:

Answer:

Erosion wears material away, and

deposition resettles it.

Answer:

The savanna biome, which is a type of grassland biome, consists of areas of open grassland with very few trees. There are two kinds of savannas: tropical and semi-tropical

Explanation:

Explanation:

once you get more than 1 answer of a question. A message is shown above each answer that is "Mark as brainiest". Click on the option to mark it the best answer ..1

Answer:

Citric acid cycle also known as the Krebs cycle, is the second stage of the three-stage process by which living cells break down organic fuel molecules in the presence of oxygen to harvest the energy they need to grow and divide.

The snake is not an endothermic animal and is actually ectothermic, so the correct option is A.

Endotherms are warm-blooded animals that maintain a constant body temperature regardless of changes in their surroundings.

Birds and mammals are the most common animals under endotherms.

Among the given animals, a snake is not an endothermic animal.

Thus, the correct option is A.

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Answer:density

=

2.9

g/cm

3

Explanation:

We're asked to find the density of the rock, given some mass and volume information.

We're given that the mass of the system before the rock was added was  

120

g

. The mass after the rock was added was  

250

g

, so the rock's mass is

m

rock

=

m

final

−

m

initial

=

250

l

g

−

120

l

g

=

130

l

g

−−−−−  

The initial volume of water in the graduated cylinder was  

30

mL

, and the volume after the rock was added read  

75

mL

, so the rock's volume is

V

rock

=

V

final

−

V

initial

=

75

l

mL

−

30

l

mL

=

45

l

mL

−−−−−−  

The equation for the density of the rock is

density

=

mass

volume

And so we have

density

=

130

l

g

45

l

mL

=

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

∣

∣

∣

2.9

l

g/mL

=

2.9

l

g/cm

3

∣

∣

∣

−−−−−−−−−−−−−−−−−−−−−−−−−

Explanation:

Answer: Bengal gram is a leguminous plant.

Explanation:

Legumes are the plants that can fix nitrogen by symbiotic mutualistic association with the soil bacteria. The bacteria converts atmospheric nitrogen into plant usable for like ammonia and derives nutrition from the plant in return. This association results in the formation of root nodule for uptake of nitrogen derivatives from the soil and return of nutrients to bacteria. Bengal gram is a leguminous plant so it can avail nitrogen with symbiotic association with the bacteria in the soil. Although nitrogen is not given in the fertilizer but the gram crops can sustain themselves by obtaining nitrogen from the soil in association with nitrogen fixing bacteria.

Answer

B. Wave A has the higher frequency. Its frequency is 25 Hz.

Explanation

Frequency is the number of oscillation/revolutions in a unit time. On the other hand, period is the time taken to complete one oscillation/revolution.

From the definition above we can conclude that, frequency(f) is the reciprocal of period(T). That is;

f = 1/T and

T = 1/f

Wave A

f = 1/(4/100)

= 100/4

= 25 Hz

Wave B

f = 1/(1/7)

= 7/1

= 7 Hz

So, wave A has the higher frequency. Its frequency is 25 Hz.

The description of the given terms are as follows,

1. Cell plate - divides plant cells made of golgi bodies

2. Spindle - made of microtubules

3. Tumor - cluster of abnormal cells

4. Cancer - cells can skirt checkpoints

5. Telomere - shortens with age

6. Cleavage furrow - pinching

7. Centrosomes - cell organizing center

The cell cycle is a sequence of events in which the cells divide into daughter cells at the end of the process. It is divided into interphase and the M phase which be either meiosis or mitosis.

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Explanation:

a. According to the Hardy-Weinberg law, the frequency of the recessive allele (q) can be calculated as the square root of the frequency of the homozygous recessive genotype (aa). Given that 4% of the population is albino (aa), the frequency of aa = 0.04, and the frequency of q = sqrt(0.04) = 0.2. The frequency of the dominant allele (p) is then 1 - q = 0.8. Therefore, the expected percentage of heterozygotes (Aa) can be calculated as 2pq = 2 × 0.8 × 0.2 = 0.32, or 32%.

b. To predict the percentage of albinos in the population in 100 years' time, we need to make certain assumptions, such as the maintenance of the same conditions that allow the Hardy-Weinberg equilibrium to be applicable. This includes the absence of mutations, gene flow, genetic drift, and natural selection. Under these assumptions, the allele frequencies remain constant from generation to generation, and the predicted frequency of the aa genotype (albinos) would be q^2 = 0.2^2 = 0.04, or 4%. Therefore, the percentage of albinos in the population would remain constant at 4%.

c. The Hardy-Weinberg equation applies under certain conditions, which are rarely met in real populations. These include random mating, large population size, absence of mutations, gene flow, genetic drift, and natural selection. Violation of these conditions can lead to changes in allele frequencies and departure from the equilibrium. Therefore, the Hardy-Weinberg law is a useful theoretical tool for understanding the genetic structure of populations, but it has limited practical applications in real-world scenarios.

Answer:

Its hard question, to be honest

The sugar backbone maintains the structure of the DNA molecule.

The structure of DNA consists of the following"

The DNA is double-stranded helical  molecule  which consists of antiparallel single strand of DNA.

The importance of the sugar backbone is to maintain the structure of the DNA molecule.

In conclusion, the DNA molecule is a double-stranded helical  molecule.

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Answer:

C. Fats

Explanation:

A parent bacterial cell is able to survive in the presence of the antibiotic penicillin. Subsequent generations from this parent will be Resistant to  penicillin.Hence, the correct option is C.

The parent bacterial cell is able to survive in the presence of the antibiotic penicillin, which suggests that it has some form of resistance to the antibiotic.

This resistance can be due to genetic mutations or the acquisition of antibiotic resistance genes. As subsequent generations of bacteria inherit the genetic material from their parent, they will also possess the resistance to penicillin. Therefore, subsequent generations from this parent will be resistant to penicillin.

Hence, the correct option is C.

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The region surrounded by guard cells is indicated by the stomata pores.

Guard cells are cells surrounding every stoma. They assist to modify the price of transpiration through beginning and final the stomata.

Light is the principle cause for the outlet or final. Each defend mobileular has a rather thick cuticle at the pore-aspect and a skinny one contrary. Guard cells are some other kind of plant cell fashions to observe early sign transduction and strain tolerance mechanisms in plants.

Guard cells are surrounded through stomatal pores and are placed in leaf epidermis. Guard cells manage inflow and efflux of CO2 and water from leaves, respectively.Guard cells are cells surrounding every stoma. They assist to modify the price of transpiration through beginning and final the stomata. Light is the principle cause for the outlet or final.

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The given statement "during normal, relaxed exhalation, the internal intercostals contract to assist with this process" is false  because the diaphragm and external intercostal muscles are primarily responsible for breathing.

The diaphragm is a dome-shaped muscle that separates the chest cavity from the abdominal cavity. When it contracts, it flattens out, increasing the volume of the chest cavity and decreasing the pressure within the lungs. This creates a pressure gradient that allows air to flow into the lungs during inhalation.

During exhalation, the diaphragm relaxes and moves back up into its dome shape, which decreases the volume of the chest cavity and increases the pressure within the lungs. The external intercostal muscles also relax, allowing the ribcage to move down and inward, which further decreases the volume of the chest cavity and assists with exhalation.

Overall, The internal intercostal muscles are only used during forced exhalation, such as during exercise or when coughing or sneezing.

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Answer:

reverse transcriptase (RT) is an enzymeused to generate complementary DNA (cDNA) from an RNA template, a process termed reverse transcription. Reverse transcriptases are used by retroviruses to replicate their genomes, by retrotransposon mobile genetic elements to proliferate within the host genome, by eukaryotic cells to extend the telomeres at the ends of their linear chromosomes, and by some non-retroviruses such as the hepatitis B virus, a member of the Hepadnaviridae.

Explanation:

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Answer:

convergent is your answer

Answer:

convergent

Explanation:

convergent is when 2 plates collide into each other

Answer:

50

Explanation:

There are 50 persons in the population that have this pattern, with an occurrence frequency for the 4 alleles of 1 in (10x20x50x500) = 1 in 5,000,000.

Variable numbers tandem repeats, called VNTRs, are the repetitive sections of the DNA strand. The fundamental benefit of STR fingerprinting over VNTR fingerprinting is that it just needs a tiny quantity of pure DNA and a short DNA sequence to carry out its activities. The main purpose of STR fingerprinting is to precisely identify a given individual's genes fingerprint. Moreover, the variable number of tandem repeats (VNTR), are brief sequences (between 20 and 100 bp) whose repetition numbers vary at particular loci in the genome among several animals, notably humans. VNTR sequences differ in length across individuals within the same species or group, hence they are frequently employed as molecular identifiers to identify people, map QTLs (quantitative trait loci), establish evolutionary connections between people/cultivars/lines, etc.

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Answer:

c

Explanation: