Gene flow can either speed or slow adaptation, depending on whether beneficial or deleterious alleles enter a population
a. true
b. false
Answer: a. true
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What provides a connection between two neurons?
A) a synapse B) a cell body C) an axon D) dendrites
What type of cells do not undergo mitosis?
A) All cells of the body except gametes (i.e., only somatic cells) B) Gametes C) Both somatic cells of the body and gametes D) Neither somatic cells of the body nor gametes
Answer the following statements true (T) or false (F)
1. Some algae are more closely related to plants than they are to other algae. 2. Protozoa are monophyletic. 3. The disappearance of diatoms from the world's oceans would result in an overall increase in the concentration of atmospheric oxygen. 4. Micronuclei are stored particles of carbohydrate and lipids.
Tacrolimus (FK-506) is a drug that inhibits an enzyme called calcineurin. Calcineurin is a protein phosphatase. This is an enzyme that dephosphorylates (removes phosphate groups) from proteins. When added to cells, tacrolimus can inhibit the dephosphorylation of a protein called NFAT, but it cannot prevent the dephosphorylation of a protein called CDK1. What is the most likely explanation for this finding?
A. Calcineurin requires an additional cofactor to dephosphorylate NFAT B. Tacrolimus is a competitive inhibitor of calcineurin for NFAT and CDK11 C. NFAT is a substrate of calcineurin, but CDK1 is not D. Tacrolimus changes the optimum pH for calcineurin