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Which statement correctly distinguishes complete aerobic glucose breakdown from lactate fermentation in human cells? A. Aerobic breakdown generates carbon dioxide, whereas lactate fermentation does not B. Lactate fermentation requires oxygen as the terminal…
Outline how sex is usually determined in humans.
Explain how sexual reproduction produces genetic variation.
A PCR protocol repeatedly heats DNA to separate its strands. Why can a heat-stable bacterial DNA polymerase remain useful through many cycles? A. It prevents the DNA strands from separating B. It replaces the need for a template strand C. It produces the…
Changes in genetic material can have different consequences. (a) Outline how mutations can contribute to cancer. (b) Outline one human disease caused by an autosomal recessive allele. (c) Explain the role of mutation in evolution. One additional mark is…
A DNA segment changes from GGA TCA AAC GTT to GGA TGA AAC GTT. Which type of change occurred? A. A whole chromosome was duplicated B. One nucleotide was inserted without replacement C. One base was replaced by another D. Three nucleotides were deleted
Animals must function under changing environmental temperatures. (a) Explain mechanisms of human thermoregulation. (b) Explain how temperature affects enzyme activity. (c) Distinguish the thermal properties of air and water in relation to animal habitats. One…
Which description fits a mature functioning sieve-tube element in an angiosperm? A. A dead hollow cell whose wall is heavily lignified B. A living cell containing cytoplasm but lacking a nucleus C. A cell filled mainly by many chloroplasts and a large nucleus…
Which description is supported by the membrane drawing? A. A peripheral protein found only on the cytoplasmic surface B. A soluble carbohydrate floating freely inside the cell C. A membrane-spanning glycoprotein that may participate in recognition D. A channel…
A neuron uses ATP to maintain the ion concentration differences associated with its resting potential. Which movement is produced by the sodium–potassium pump? A. Both sodium and potassium move into the neuron B. Sodium moves out and potassium moves in C.…