A dihybrid cross yields 320 F2 offspring. How many are expected to resemble the homozygous recessive parental?

A) 10
B) 16
C) 20
D) 60
E) 180


C

Biology & Microbiology

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Which is NOT a stimulus that the simplest sensory receptors, free nerve endings, will respond to?  

A.  bending of the sensory neuron membrane B.  changes in temperature C.  changes in the oxygen content of the extracellular fluid D.  release of odorants from freshly baked bread E.  stretching of the sensory neuron membrane

Biology & Microbiology

Arsenic poisoning can lead to organ failure and death. Though arsenic can inhibit or interfere with a number of cellular enzymes, arsenic poisoning is thought to be mainly due to indirect inhibition of enzymes involved in both pyruvate oxidation and the Krebs cycle. As a result, this compound must be able to enter which cellular compartment?

A. the intermembrane space of the mitochondria B. the nucleus C. the endoplasmic reticulum D. the cytoplasm E. the mitochondrial matrix

Biology & Microbiology

Which of the following is a byproduct of photosynthesis?

A) carbon dioxide B) water C) oxygen D) glucose E) energy

Biology & Microbiology

Which portal of exit will a bloodborne pathogen likely use?

A) GI mucosa B) ocular C) respiratory mucosa D) skin E) parenteral

Biology & Microbiology