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chubhunter [2.5K]
3 years ago
6

Which of the following serves as the cell's boundary from its environment

Biology
1 answer:
Bad White [126]3 years ago
4 0
B. Cell membrane
Remember cell membrane is the structure aka “wall of the house” is the clear boundary between the cells internal and external environments:))
Hope this helps
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Determine if the gene for this trait resides on an autosome or sex chromosome. Use evidence to support your answer
inn [45]

Answer:

autosome

Explanation:

if it were on a sex chromosome then either more females would have it or more males would have but it's almost split evenly

5 0
3 years ago
masteringbio JFor each of the studies described below, indicate if it is hypothesis driven and whether the scientist is employin
juin [17]

Incomplete question. The remaining part of the question read;

Words in the left column:

  • Yes
  • No
  • Observational
  • Manipulative

1. A physiologist incubates eggs in the lab at a range of temperatures to see what temperatures produce males and what temperatures produce females.

2. A biologist predicts that shade might influence ground temperature, and therefore turtle sex ratios. He records the sex ratio of turtle hatchlings in shaded and unshaded regions

3. An ecologist predicts turtles grow larger when no predators are around. She places turtles in an experimental pond system where half the ponds have predators and half the ponds have had the predators removed.

4. A climatologist predicts that concentration of CO2 in a city will be negatively correlated with the amount of wind in that city. He collects data and looks at the amount of CO2 in a city as a function of the wind speed in the city.

5. A sociologist conducts a survey in Hawaii to describe people's attitudes about global climate change.

6. A scientist determines the average wind speed, and variation in the amount of wind, in a number of locations to see which locations would be most suitable for wind turbines

<u>Answer/Explanation:</u>

1. <u>Hypothesis-driven?</u> Yes!

<u>Observational or Manipulative?</u> Observational.

We can make this conclusion here that the physiologists' research is hypothesis-driven since we are told he wanted to <em>"see what temperatures produce males and what temperatures produce females." </em>In other words, he wanted to know whether the temperature used in incubators can influence the sex of an egg by means of observation.

2. <u>Hypothesis-driven?</u> Yes!

<u>Observational or Manipulative?</u> Observation.

3.  <u>Hypothesis-driven?</u> Yes!

<u>Observational or Manipulative?</u> Manipulative.

We can make the conclusion that is the ecologist used the manipulative method in her research since she decided to place the turtles in two different types of ponds; one where half the ponds have predators while in the other the pond the predators have been removed. In other words, she manipulated the independent variables.

4. <u>Hypothesis-driven?</u> Yes!

<u>Observational or Manipulative?</u> Observational.

Note, the use of the word, "predicts" in most instances underscores the tone of hypothesis-driven research, hence we can say Yes! And remember, we are told the researcher "collects data", meaning he is merely observing differences that occur naturally.

5. <u>Hypothesis-driven?</u> No!

<u>Observational or Manipulative?</u> Observational.

<u>6. Hypothesis-driven?</u> No!

<u>Observational or Manipulative?</u> Observational.

5 0
3 years ago
Why do vaccines work for some diseases but not others?
otez555 [7]

Answer:

The antibodies produced by a vaccine only fight specific antigens.

Explanation:

Antibodies only bind to specific antigen during an immune reaction. The introduction of foreign substance in the body stimulate the B-cells to produce antibodies that fight against infections. Only specific antibodies are produced following antigen presenting cells that bind to antigens. They capture and display the antigens to the antibodies.

3 0
3 years ago
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how does the number of chromosomes in a sex cell compare with the number of chromosomes in body cells?
Oksi-84 [34.3K]
<span>Meiosis reduces chromosome number so that sex cells (eggs and sperm) have a half set of chromosomes–one homolog of each pair. This is the haploid number. CONGRATULATIONS! YOU'RE SO SMART!</span>
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3 years ago
The derived characteristic of protostome development is found in which of the following phyla?
slava [35]

B. Roundworms<span>. 

The Protostome organisms are subclustered into three main groups, moreover nematoda or roundworms belongs to the Ecdysozoa group.</span>

<span>Roundworms are organisms that are diverse and almost in clustered to many other ecosystems and environment. 

These Protostome  includes mollusks, annelids, and arthropods

</span>

3 0
3 years ago
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