A microbial species is able to survive in near freezing temperatures. Its cell membrane is able to stay fluid at such temperatures because
it has sterols (like cholesterol) in its membrane
it has a higher amount of protein in its membrane
it has a thicker glycocalyx
it has a thick cell wall
The Correct Answer is A
A. It has sterols (like cholesterol) in its membrane: Sterols insert themselves between phospholipids in the cell membrane, preventing tight packing of fatty acid chains. This helps maintain fluidity even in cold environments, allowing essential processes like transport and signaling to continue.
B. It has a higher amount of protein in its membrane: While membrane proteins are crucial for transport and enzymatic functions, they do not significantly impact the bilayer’s ability to remain fluid in near-freezing temperatures.
C. It has a thicker glycocalyx: The glycocalyx primarily aids in protection, adhesion, and biofilm formation. It does not play a major role in maintaining membrane fluidity under cold stress.
D. It has a thick cell wall: A thick cell wall protects against osmotic lysis and provides shape, but it does not regulate the lipid bilayer’s flexibility or prevent rigidity in freezing conditions.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. The process of producing more cells: Producing more cells describes cell division or growth, which increases the number of cells but does not encompass the overall progression toward a mature form.
B. The process of producing larger cells: Increasing cell size is a part of growth at the cellular level but does not capture the broader concept of development involving structural and functional changes over time.
C. The process of responding to environmental changes: Responding to environmental changes refers to sensitivity or adaptation, which helps an organism survive but is separate from the developmental process.
D. The process of changing from an original form to a final form: Development involves the transformation of an organism from its initial state to a mature form, including differentiation, growth, and functional specialization, reflecting the progression from origin to maturity.
Correct Answer is D
Explanation
A. growing corn plants with various amounts of fertilizer: Using corn plants introduces a different species, which makes results irrelevant to the effect of fertilizer on tomato plants.
B. growing tomato plants with various amounts of fertilizer: This is part of the experimental group rather than a control, as it tests different fertilizer levels rather than providing a baseline for comparison.
C. growing corn plants without fertilizer: Corn plants are not suitable because the research question focuses on tomato plants. A valid control must match the species being studied.
D. growing tomato plants without fertilizer: This is the correct control, as it provides a baseline growth rate for tomato plants without fertilizer, allowing meaningful comparison with fertilized groups.
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