The migratory patterns of many animals encourage ____
a. a bottleneck
b. mutation
c. a founder effect
d. gene flow
e. genetic drift
ANSWER: d
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If tall (D) is dominant to dwarf (d), and two homozygous varieties DD and dd are crossed, then what
kind of offspring will be produced? a. all intermediate forms b. all tall c. all dwarf d. 1/2 tall, 1/2 dwarf e. 3/4 tall, 1/4 dwarf
Arabidopsis is a model organism for the study of ________
Fill in the blank(s) with correct word
Why do scientists believe that mitochondria may have evolved from ancient bacteria?
a. because both have their own DNA and ribosomes b. because both have five chromosomes c. because both are surrounded by a cell wall d. because the shapes and size of both are exactly the same
Over 90% of Staphylococcus aureus isolates are penicillin-resistant. Why?
A) They have loosely organized polysaccharide slime layers which protects their cell wall. B) They produce coagulase. C) They have a coating of protein A. D) They produce ?-lactamase. E) They produce staphylokinase.