Question

study the diagram.
based on the diagram, which statement is true?
a genes are made up of chromosomes.
b chromosomes contain a single gene.
c centromeres hold instructions for how to make proteins.
d genes are present on chromosomes and control traits in an individual.
question 80
what structure is found in the nucleus of a cell and is made up of coiled strands of dna?
a protein
b gene
c chromosome
d centriole

Explanation:

• Question 99:
• Genes are segments of DNA on chromosomes. Chromosomes are made of DNA and proteins. A chromosome contains many genes. Centromeres are the constricted regions of chromosomes and do not hold instructions for making proteins. Genes are present on chromosomes and control traits (as shown in the diagram where gene → protein for facial feature → face shape).
• Question 100:
• A protein is a macromolecule made by ribosomes using instructions from DNA. A gene is a segment of DNA. A centriole is involved in cell division. A chromosome is a structure in the nucleus made up of coiled strands of DNA (along with proteins).

Answer:

• Question 99: D. Genes are present on chromosomes and control traits in an individual.
• Question 100: C. chromosome.