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IgorC [24]
3 years ago
12

Which best explains why viruses do not have special structures or enzymes that allow them to make their own food? Viruses can us

e energy of living cells that they infect. Viruses can replicate inside a host that they infect. Viruses can cause contagious illnesses in host cells. Viruses integrate their RNA or DNA into infected cells.
Biology
1 answer:
padilas [110]3 years ago
6 0

Answer:

Viruses can use energy of living cells that they infect.

Explanation:

Hope it helps.

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You have learned that the fusion of egg and sperm produces a zygote. But how does the sperm reach the egg, and how does the zygo
FrozenT [24]

Answer:

Pollen grain lands on stigma

Explanation:

A) Pollen grain lands on stigma

  • pollen tube grows down the style
  • generative cell divides, forming two sperm
  • two sperm are discharged to them female gametophyte
  • sperm fuse with the egg and two polar nuclei
  • zygote forms and divides into a terminal cell and a basal cell
  • cells of embryo differentiate into three tissue types---- seed dries out and becomes dormant.

B)

  1. During pollination, a pollen grain is transferred from an anther to a stigma. Once the pollen grain lands on a suitable stigma, it germinates and forms a pollen tube, a structure that grows down through the style to the ovary.
  2. Once in the pollen tube, the generative cell from the pollen grain divides by mitosis, forming two sperm. The sperm travel down the pollen tube and are discharged into the female gametophyte. In a process called double fertilization, one sperm fertilizes the egg, forming the zygote; the other sperm fuses with two polar nuclei in the female gametophyte, forming a triploid (3n) nucleus. The zygote develops into the plant embryo, and the triploid nucleus divides and gives rise to the endosperm. Double fertilization prevents the waste of the plant's resources by ensuring that the nutrient-rich endosperm only develops if the egg is fertilized.
  3. After double fertilization, the ovule starts to develop into a seed containing the plant embryo. As the embryo develops, the three tissue systems are established, and the cotyledons (seed leaves) form. The seeds of many species dry out as they mature. These dry seeds lie dormant until suitable germination conditions occur.

3 0
3 years ago
Three groups of students in Mr. Walker's science class were assigned the task of designing an experiment to test
Kipish [7]
D) it has to depend on the type of crypt
3 0
3 years ago
All living things depend upon a genetic code for reproduction
Nuetrik [128]
What type of answer are you looking for? DNA? Or inheritance? Genes?
5 0
3 years ago
Which is the role of restriction enzyme.
Murljashka [212]
<span>The role of a restriction enzyme is essentially used to cut a single gene from a larger piece of DNA. It has a very important role to play in experiments investigating cloning, and in the construction of particular DNA molecules.</span>
6 0
3 years ago
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Which effect of temperature rise causes a feedback resulting in a rise in global temperatures?
Black_prince [1.1K]

Answer:

c less water vapor in the atmosphere

8 0
3 years ago
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