Double helix discovery, genetic sequencing, chromosomes, and heredity.
Test your knowledge with these top questions!
How can genetic mutations lead to cancer in human cells?
Cancer often starts when mutations damage genes that tell cells when to divide and when to stop.
Which sex chromosome pattern typically occurs in human males?
Typical females have two X chromosomes, while typical males have one X and one Y.
What shape does a human mitochondrial DNA molecule normally form?
Its compact circular form resembles bacterial DNA, reflecting mitochondria's origin from bacteria long ago.
Human chromosomes contain DNA wrapped around which kind of molecules?
The wrapping proteins are histones; packaging long DNA molecules helps chromosomes fit inside a microscopic cell nucleus.
Which cell structures build human proteins from messenger RNA instructions?
Ribosomes link amino acids into chains that fold into working proteins like enzymes and hormones.
During human DNA replication, which base pairs with adenine?
Adenine and thymine join with two hydrogen bonds, while guanine and cytosine share three.
A typical human son inherits his X chromosome from which parent?
A father's sperm typically supplies the Y chromosome, while the mother's egg supplies the son's X.
Which molecule carries DNA instructions from the nucleus to human ribosomes?
RNA polymerase copies a gene into messenger RNA, which leaves the nucleus for ribosomes to read.
Which two letters label the human sex chromosomes?
Females typically have two X chromosomes, while males typically have one X and one Y.
Honeybee larvae develop into queens instead of workers mainly because of what?
A diet of royal jelly triggers gene-activity changes that grow a long-lived, egg-laying queen from the same genome.