Gram-positive cultures older than 24 hours may stain Gram negative due to changes in the peptidoglycan layer.
A) True
B) False
A) True
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Describe the movement of oxygen and carbon dioxide during gas exchange.
A. Oxygen diffuses out of the lungs into red blood cells and carbon dioxide diffuses out of red blood cells into the kidney nephrons. B. Carbon dioxide diffuses out of the lungs into red blood cells and oxygen diffuses out of red blood cells and into the lungs. C. Oxygen diffuses out of the lungs into red blood cells and carbon dioxide diffuses out of red blood cells and into the lungs.
A maternal effect mutation bicoid (bcd) is recessive. The bcd allele makes no Bicoid protein. In the absence of the Bicoid protein, product embryogenesis is not completed and eggs fail to hatch into viable larva
Consider a cross between a female who is heterozygous (bcd+/bcd) and a homozygous mutant male (bcd/bcd). a. How is it possible for a male homozygous for the mutation to exist? b. Predict the outcome (normal and/or failed embryogenesis) in the F1 and F2 generations resulting from this cross.
Reproduction in the black bread mold occurs between __________ hyphae
a. male and female b. + and ? c. dikaryotic and monokaryotic d. heterothallic and homothallic e. sterile and self-sterile
The long, thread-like branching cells of molds are called ________.
A. hyphae B. septa C. pseudohyphae D. conidiophores E. asci