Select the best response to the question.
?What is a risk factor for contracting tapeworm or hookworm?
A) poor sanitation
B)living or traveling in the Middle East
C) living in a nursing home
D) young age
A
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Serratia marcescens bacteria has a gene that regulates red pigment production by cells. A student inoculates two nutrient agar plates of Serratia and incubates one at 25oC and the other at 37oC. Following incubation, the student observes that colonies on the 25oC plate are red while those on the 37oC plate are nonpigmented. Which of the following statements is a logical conclusion based on these results?
A. This is an example of constitutive gene expression. B. Serratia cells undergo a genotypic change that is proportional to changes in temperature. C. Low temperatures cause repression of certain housekeeping genes. D. Serratia genes for pigment production are induced at certain temperatures.
The following items are organelles found in animal cells
Respond to statements 100–108 with reference to these organelles. a. ribosome b. mitochondrion c. lysosome d. Golgi body e. endoplasmic reticulum E 100. This organelle is the site of polypeptide assembly. M 101. The cellular digestion and disposal of biological molecules occurs inside this organelle. M 102. Aerobic respiration occurs in this organelle. M 103. RNA carries out the genetic code translation process in association with ribosomes on this organelle. Chapter 4 Cell Structure and Function 11 M 104. The packaging of secretory proteins occurs in association with this structure. M 105. This organelle is involved in lipid production and protein transport. E 106. Proteins are synthesized on this tiny, two-part organelle. E 107. Sugar metabolism occurs in association with this organelle. D 108. DNA synthesis occurs in the nucleus. Its breakdown can occur in this organelle.
The most specific and sensitive method for detecting genetic defects in an embryo is __________
A. amniocentesis D. karytotyping B. chorionic villus sampling E. recombinant DNA techniques C. PGD
The theory of natural selection states that
A) random assortment of genes results in better physical characteristics in the following generations. B) individuals that mutate in response to changes in their environment will contribute the most genes to the next generation. C) only the largest and strongest individuals survive. D) all individuals live to reproduce in each generation. E) the most well-adapted individuals in their environments survive and reproduce, contributing the most genes to the next generation.