If a light-eosin eye male Drosophila is crossed to a homozygous red eyed female, what will be the phenotype of their offspring?
A. All offspring will have red eyes
B. All males will have light-eosin eyes and all females will have eosin eye
C. All females will have red eyes, all males will have light-eosin eyes.
D. All flies will have white eyes.
A
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What character state distinguishes Cnidarians from Bilaterians in the phylogenetic tree in Figure 35.2?
A. presence or absence of ganglia B. presence or absence of sensory neurons C. presence or absence of interneurons D. presence or absence of motor neurons
Epiglottitis is a potentially life-threatening disease because the patient's airway can become completely obstructed (blocked) if not treated. Which bacterium usually causes this disease?
a. Haemophilus influenzae type B b. Corynebacterium diphtheriae c. Streptococcus pyogenes d. Type A influenza virus
Successful anti-HIV drug therapies today work by blocking the action of viral reverse transcriptase. Select which step of virus multiplication that would be directly blocked by this mechanism.
A. Adsorption B. Assembly C. Penetration D. Synthesis E. Release
The simultaneous movement of Na+ out of a cell against its concentration gradient and protons into a cell with their concentration gradient is best described as an example of
a. symport. b. passive diffusion. c. antiport. d. facilitated diffusion. e. active transport