Biology Quarter 3 Practice

DNA is able to control cellular activities most directly by regulating the process of

• Meiotic cell division

• Protein synthesis

• active transport

• selective breeding

Which series is arranged in decreasing size of structures?

• Nucleus, chromosome, DNA, nucleotide, nitrogenous base

• DNA, nucleus, chromosome, nucleotide, nitrogenous base

• Nucleotide, chromosomes, nitrogenous base, nucleus, DNA

• Chromosome, nucleus, nitrogenous base, nucleotide, DNA

Which amino acid is coded by the mRNA codon UUU?

• Ser

• Phe

• Leu

• Tyr

Which mRNA codon codes for the amino acid Serine?

• UCU

• UGG

• UAA

• UGA

Electrophoresis is a method of

• Indicating the presence of starch

• Separating colored compounds on a strip of paper

• Changing the genetic code of an organism

• Separating DNA fragments

Structure X is a

• mitochondria

• vacuole

• nucleus

• ribosome

mRNA received its information from what molecule?

• ribosome

• tRNA

• nucleus

• DNA

The diagram below represents a technique used in some molecular biology laboratories. What type of technique does this represent?

• gel electrophoresis

• direct harvesting

• genetic engineering

• chromatography

A normal human egg cell contains

• 44 body chromosomes and two XX chromosomes

• 22 body chromosomes and one Y chromosome

• 22 body chromosomes and one X chromosome

• 44 body chromosomes and one X and one Y chromosome

The DNA in the diagram shown is most similar in which two children?

• Child A

  Child B

• Child C

  Child D

• Child A

  Child C

• Child B

  Child D