The most probable cause for the difference in mean stem length between plants in dish A and plants in dish B is which of the following?
(A) Shortening of cells in the stem in response to the lack of light
(B) Elongation of seedlings in response to the lack of light
(C) Enhancement of stem elongation by light
(D) Genetic differences between the seeds
Ans: (B) Elongation of seedlings in response to the lack of light
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Which of the following traits is considered Mendelian?
A) A trait which is caused by linked genes B) A trait which is caused by a single gene C) A trait which is caused by environmental factors D) A trait which is multifactorial
Thylakoids are structures associated with the ____________ of chloroplasts
a. pigments b. stroma c. grana d. cristae
Linked DNA segments from humans and vectors, such as plasmids, are called
____________________ molecules. Fill in the blank(s) with the appropriate word(s).
Safety considerations in the Microbiology laboratory are crucial for protecting personnel. However, it is also important to think about “protecting” the microorganisms in the experiment that you are performing and not contaminating your culture. Lab workers who are carriers, or who are sick, can contaminate cultures. A pure culture could also be contaminated with another lab strain. What precautions must be taken to prevent contamination of a pure culture?
A) Use of gloves, disinfecting gloves between handling cultures, handling cultures only in a biosafety cabinet, and using lab materials for only 2-3 cultures prior to disposal or autoclaving B) Use of gloves, disinfecting gloves between handling cultures, handling cultures on an open benchtop, use lab materials for only one culture before disposal or autoclaving C) Use of gloves, disinfecting gloves between handling cultures, handling cultures only in a biosafety cabinet, use lab materials for only one culture before disposal or autoclaving