Sharks have a number of fleshy gill slits instead of a bony gill cover. How does this affect their behavior?
A. They do not maintain neutral buoyancy.
B. Their movements are slow due to low oxygen.
C. They live only in highly oxygenated water.
D. They keep swimming to move water across their gills.
Answer: D
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When yeast cells of opposite mating types are in close proximity, cell changes occur inside those cells that result in the polymerization of actin filaments, allowing the yeast cells to mate
Those changes in cell behavior are initially due to signaling molecules (pheromones) released by the yeast cells. Pheromones are A) a type of steroid hormone that diffuses through the plasma membrane causing cytoplasmic actin proteins to form filaments B) a type of hormone that binds cell surface receptors causing cytoplasmic actin proteins to form filaments C) signaling molecules that bind cell surface receptors causing yeast cells to become motile, insuring mating success D) signaling molecules that cause the extracellular matrix of yeast cells to thicken in preparation for cell fusion E) signaling molecules that cause intracellular G proteins to be inhibited
A septate hyphae is microscopically observed using lactophenol cotton blue. Which organism can be ruled out as the cause of infection on the basis of this information?
a. Aspergillus b. Bipolaris c. Microsporum d. Rhizopus
Chromosomes influence phenotype by _____
1.carrying genes that encode instructions for particular proteins 2.directly manufacturing individual proteins 3.directly manufacturing individual genes 4.carrying proteins that encode instructions for particular genes
There are seven cervical vertebrae located in the neck and during the course of evolution, these vertebrae have become fused.
a. true b. false