Which of the following best describes sponges?
A. They are symmetrical, lack tissues, and do not move.
B. They are asymmetrical, lack tissues, and do not move.
C. They are asymmetrical, have tissues, and do not move.
D. They are symmetrical, have tissues, and do not move.
Answer: B
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In placental mammals, such as humans, the dosage compensation mechanism to equalize expression of sex-linked
genes in males and females involves ____.
a. doubling the gene expression for most genes on the X chromosome in males b. doubling the number of X chromosomes in males during embryonic development c. having all major genes on the X chromosome also present on the Y chromosome d. halving the gene expression for most genes on each X chromosome in females e. inactivating one of the two X chromosomes in most female somatic cells
Some protobionts have been shown to have the ALL of following features except
a. divide by binary fission. b. maintain a chemical environment different from their external environment. c. metabolize certain compounds. d. grow in size. e. disorganization
It is likely that a hospitalized patient with a high lymphocyte count has some type of infection
Indicate whether the statement is true or false
A type of transport of a solute across a membrane, up its concentration gradient, using protein carriers driven by the expenditure of chemical energy is known as
A. exocytosis. B. osmosis. C. active transport. D. diffusion. E. facilitated transport.