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Pie
2 years ago
9

This seems really pity I know, but my biology course reading doesn't help answer these questions whatsoever- at least not in a w

ay that would be easy to understand so, brainly please help.
1) Why did 40% of the human population evolve to tolerate lactose?(1 point)

A Lactose tolerance allows people to enjoy a wide variety of food, including milk, butter, ice cream, and cheese.

B People who have an intolerance experience physical pain, so a tolerance evolved to avoid that.

C Within cultures that rely on milk-producing animals, individuals who tolerated lactose had a survival advantage.

D Babies rely on milk to survive, so they need to be able to tolerate lactose.

2) What is the difference between genetic drift and natural selection?(1 point)

A Genetic drift is the change in a population’s genes over time; natural selection is the evolution of a population over time.

B Genetic drift is the frequency of genes in a population; natural selection is the frequency of adaptations in a population.

C Genetic drift is the random increase or decrease of certain genes in a population; natural selection is not random.

D Genetic drift is the selection of random traits in a population; natural selection is the selection of specific traits.

3 What is an interferon?(1 point)

A An interferon is used by a virus to stop the body from detecting it.

B An interferon disrupts DNA replication.

C An interferon reduces the efficacy of antibiotics on bacteria.

D An interferon activates the body’s immune system response to a virus.

4 Why is there such a wide variety of immune system responses between hosts when they are infected with the same virus?(1 point)

A Slight variations due to mutations in the virus trigger different responses in people.

B People that have already been infected are asymptomatic.

C Some viruses are resistant to antibiotics, so they cause a stronger immune system response.

D Each person’s immune system employs different tactics to get rid of the virus.

5 Is the following statement true? “Antigenic drift and other mutations to the DNA of viruses are always beneficial for the virus.”(1 point)

A Yes, because mutated viruses are able to infect more hosts.

B Yes, because mutated viruses have less mRNA so they can copy and replicate faster.

C No, because mutated viruses are may be less likely to replicate.

D No, because different mutations cause a variety of immune responses.
Biology
1 answer:
blsea [12.9K]2 years ago
7 0

Answer:

1. D- Within cultures that rely on milk-producing animals, individuals who tolerated lactose had a survival advantage.

2. B- Genetic drift is the random increase or decrease of certain genes in a population; natural selection is not random.

3. A- An interferon activates the body's immune system response to a virus.

4. D- Each persons immune system employs different tactics to get rid of the virus.

5. D- yes, because mutated viruses are able to infect more hosts.

i just did this test, 100% with these answers

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Which of the following would be LEAST likely in the fossil record? Which of the following would be LEAST likely in the fossil re
GREYUIT [131]

Answer:

The correct answer is desert-dwelling species.

Explanation:

Any preserved remains, trace or impression of anything, which was once living in the past is termed as a fossil. The examples of fossils comprise stone imprints of microbes or animals, bones, exoskeletons, shells, coral, remnants of DNA, the substances getting preserved in amber, and others.  

For the formation of fossils, the most essential condition is decomposition that takes place gradually, that is, at a slow pace. Thus, places like wet marshy areas will be the locations where the maximum of the fossils can be found as such places provide optimum conditions for slow mineralization and decomposition of bones.  

On the other hand, places like deserts would be the least likely to have a fossil record as deserts are devoid of optimum conditions required for the formation of fossils. In places like a desert, decomposition and demineralization of the components like bones take place at a brisk rate.  

5 0
3 years ago
Which diagram best explains changes to the composition of blood in the lungs?
fredd [130]

Answer:

A

Explanation:

Just because

7 0
3 years ago
A planet has a mass of 5.97 x 1024 kg and a radius of 6.38 x 106 m. Find the weight of a 65.0 kg person at 1000 km above the sur
mote1985 [20]

<u>Answer:</u> The weight of the person above the surface of a planet is 635.83N.

<u>Explanation:</u>

To calculate the weight of a person, we use the formula:

w=mg     ....(1)

where,

w = weight of an object

m = mass of the person = 65kg

g = acceleration due to the gravity of the planet

For the calculation of weight, we need to first find the acceleration due to gravity and for that we use the formula:

g=\frac{GM}{r^2}

where, g = acceleration due to gravity = ?m/s^2

G = Universal gravitational constant = 6.67\times 10^{-11}Nm^2/kg^2

M = mass of the planet = 5.97\times 10^{24}kg

r = distance of the person from the planet = 6.38\times 10^6m

Putting values in above equation, we get:

g=\frac{(6.67\times 10^{-11}kgm/s^2.m^2/kg^2)(5.97\times 10^{24}kg)}{(6.38\times 10^6m)^2}\\\\g=9.782m/s^2

Putting this value in equation 1, we get:

w=65kg\times 9.782m/s^2=635.83N

Hence, the weight of the person above the surface of a planet is 635.83N.

7 0
2 years ago
Consider the classification levels of a honey bee.
frez [133]

Answer:

Insecta

Explanation:

The classification levels are the following from broadest to the most specific:

Domain

Kingdom

Phylum

Class

Order

Family

Genus

Species

In your selection it is listed in that order:

Domain   --- Eukarya

Kingdom --- Animalia

Phylum  --- Arthropoda

Class     --- Insecta

Order    --- Hymenoptera

Family   --- Apidae

Genus   --- Apis

Species --- Mellifera

When you name the organism, we use the two name or binary naming system, getting the genus and the species. So the scientific name of the honey bee is: Apis mellifera

4 0
3 years ago
Read 2 more answers
What percentage of earths history has included present day humans?
HACTEHA [7]
The timeline of human evolution outlines the major events in the evolutionary lineage of the modern human species, Homo sapiens, throughout the history of life, beginning some 4 billion years ago down to recent evolution within H. sapiens during and since the Last Glacial Period.
8 0
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