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8090 [49]
3 years ago
11

10) Why do viruses need living hosts, such as bacteria or eukaryote cells? A) The host cell is the source of food for the virus.

B) Viruses depend on the host cells that they infect to reproduce. C) Viruses have a cellular structure which never require a host. D) Viruses depend on a host cell because they lack their own DNA or RNA.
Biology
1 answer:
bija089 [108]3 years ago
7 0

B.) is 100% correct

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Nucleotides are the basic unit of which macromolecules ?
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Tissue culture experiments with PDGF demonstrate that without this substance _____.
Sergeeva-Olga [200]

Answer:

Answer is 2. Fibroblasts fail to divide.

Explanation:

Tissue culture experiment is the experiment where tissues are grown in an artificial medium. This involves the use of growth medium such as agar or broth. This process help to produce needed tissues in a short period of time.

Fibroblasts are cells which are found in the collective tissues, and they produce collagen. The collagen produced by the Fibroblasts play important role in tissue repair. Fibroblasts are regarded as the main cells in the connective tissue.

Note that, PDGF, which is Platelet -derived growth factor in full, is a growth factor regulating cell growth and it's division.

5 0
2 years ago
3. What are two major phases of cell division?
Igoryamba
3# Interphase is divided into three phases: G1, S, and G2. The subsequent mitotic (M) phase consists of two processes: mitosis, the process of nuclear division, and cytokinesis, division of the cell's cytoplasm. Each mitotic phase results in the formation of two cells that are genetically identical to the parent.

Sorry I can't remember the rest of the questions.
5 0
3 years ago
When blood pH becomes overly acidic, respiration and kidney function change to bring the acidity back to its normal pH level of
lapo4ka [179]

Answer:

homeostasis

Explanation:

Homeostasis has to do with processes that maintain the internal balance within an organism. It can succinctly be defined as the process of regulating an organism's internal environment. The process of homeostasis is very important in the maintenance of important indicators of balance in the body such as body temperature, body pH, etc.

Hence, when blood pH becomes overly acidic, respiration and kidney function change to bring the acidity back to its normal pH level of 7.4. This is a homeostatic response.

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2 years ago
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