During DNA replication, what is the role of helicase?

It unwinds the double helix and separates the two strands

A single nucleotide is deleted near the start of the coding region of a gene. The most likely effect on the protein is:

a frameshift that changes most amino acids after the deletion

Which feature helps a xerophyte reduce water loss?

Stomata sunken in pits that trap humid air

Blood glucose falls several hours after a meal. Which response restores it?

Alpha cells release glucagon, which stimulates the liver to break down glycogen

What is the main role of helper T cells in the adaptive immune response?

They release signals that activate B cells and cytotoxic T cells

During which stage of meiosis does crossing over occur, and what does it produce?

Prophase I; new combinations of alleles on the chromosomes

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TCE Biology (BIO315124) criteria 3 to 8: exam-style practice quiz

12 questions. Pick an answer and you'll see why right away. Options are shuffled each attempt, and the review at the end links each missed question to the dot point to revise.

During DNA replication, what is the role of helicase?
An mRNA codon reads AUG. Which tRNA anticodon pairs with it?
A single nucleotide is deleted near the start of the coding region of a gene. The most likely effect on the protein is:
Which stage of cellular respiration takes place in the cytoplasm rather than in the mitochondria?
Which change in conditions would decrease the rate of transpiration from a plant?
Which feature helps a xerophyte reduce water loss?
Blood glucose falls several hours after a meal. Which response restores it?
What is the main role of helper T cells in the adaptive immune response?
A newborn baby is protected against measles for a few months by antibodies that crossed the placenta from the mother. This is:
During which stage of meiosis does crossing over occur, and what does it produce?
In snapdragons, flower colour shows incomplete dominance: red (RR), pink (RW) and white (WW). Two pink plants are crossed. The expected ratio of offspring colours is:
A person with blood group A (genotype $I^Ai$ ) has children with a person with blood group O ( $ii$ ). The expected proportions of blood groups among the children are: