How can an individual carry a defective gene but not exhibit the defective phenotype?
a) An individual may not have that defective gene in every cell, and so appear normal
b) Individuals carry two copies of gene instructions, and one dominant allele could mask the presence of a recessive defective allele
c) Individuals are always homozygous
d) Both a) and c) are true
e) None of the above is true
Ans: b) Individuals carry two copies of gene instructions, and one dominant allele could mask the presence of a recessive defective allele
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Why is innate host resistance a type of nonspecific immune response?
A. Innate resistance is nonspecific because it depends on the life experience of the individual, for example, receiving a vaccine or acquiring a disease due to a particular pathogen. B. Innate resistance is nonspecific because any foreign material, microorganisms, or antigens encountered by the host are targeted. C. Innate resistance is nonspecific because any type of immune response, such as inflammation, phagocytosis, or humoral immunity, is activated in the host by foreign material. D. Innate resistance is nonspecific because it is impossible to determine the specific degree by which any host will respond when foreign material or microorganisms are present.
What are protocells and why are they considered important?
What will be an ideal response?
Glycolysis depends upon a continuous supply of NAD+ and ____
a. NADP b. pyruvate c. glucose d. NADH e. H2O
A physician has a patient with an abnormal heart sound. After running some tests, the doctor decides that the patient has a heart murmur, but the condition is not severe enough to warrant open-heart surgery. Which of the following would lead the doctor
to make this determination? A) The amount of blood flowing backward in the heart is not enough to strain the heart as it works harder to catch up. B) The heart sounds are due to air moving through the system and cannot be removed via surgical techniques. C) A heart murmur is actually caused by a harmless lung irregularity. D) The amount of blood lost is easily replaced with a transfusion of extra blood.