The semi-fluid matrix that surrounds organelles in a cell is called the:

A. stroma.
B. nucleoplasm.
C. ribosome.
D. cytoplasm.


D

Biology & Microbiology

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Which of the following molecules is not considered a porphyrin?

A. Hemoglobin B. Peptidoglycan C. Vitamin B12 D. Chlorophyll

Biology & Microbiology

If an Arabidopsis plant does not express homeotic genes during flower development

A. The plant will die. B. The plant will only develop to the heart stage. C. The plant will not develop cotyledons. D. The plant will develop leaves instead of flowers. E. The plant will develop flowers instead of leaves.

Biology & Microbiology

Which disease is caused by an enveloped virus?

a. hepatitis b. AIDS c. polio d. common colds e. warts

Biology & Microbiology

Two parents with Type A and Type B blood have a child with Type AB blood. How is this possible?

A. Type A blood is incompletely dominant to Type B blood. This means that individuals with alleles for both Type A and Type B will express a blended intermediate between these two blood types. B. Type A blood is codominant with Type B blood, so both alleles are expressed equally. C. Type A blood is co-recessive with Type B blood, so as long as there is not a dominant blood type present, both recessive alleles will be expressed equally. D. This is not possible. The child cannot be their biological child.

Biology & Microbiology