What makes the cells of a developing embryo differentiate into various types of cells?
A) They have different genes.
B) Different genes are activated.
C) Once certain genes of a cell have caused it to differentiate, the other genes are lost.
D) The DNA of their mitochondria is different.
E) Special genes in the cytoplasm cause this differentiation.
B
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In house sparrows (Passer domesticus) it is generally found that both males and females care for the eggs and young
However, some male house sparrows do not provide parental care. In addition, it is known that young that receive parental care from both the male and female are more likely to survive to fledging (leaving the nest). Which of the following activities by males that do not provide parental care would represent the most beneficial trade-off for the reduced survival of their offspring? A) attacking the nests of neighboring males B) mating with additional females and fathering more eggs C) eating to build up energy stores for migration D) grooming to eliminate parasites from their feathers
In eukaryotic cells, the oxidation of pyruvate occurs in:
A. the cytoplasm. B. the nucleus. C. the matrix of the mitochondria. D. the endoplasmic reticulum. E. vacuoles.
All viruses have genes encoding at least:
a. their coat proteins. b. enzymes required for nucleic acid replication. c. their coat proteins and enzymes required for nucleic acid replication. d. a plasma membrane. e. their coat proteins and a plasma membrane.
The majority of carbon dioxide carried in the blood is found in which form?
a. dissolved in plasma b. bound to hemoglobin c. converted to bicarbonate d. converted to oxygen e. bound to the respiratory membrane