Life at the Molecular and Cellular Level-3

What is the correct sequence for plant cell mitosis?

• A, B, D, C

• C, B, A, D

• B, A, D, C

• D, C, B, A

The reduction of the chromosome number during meiosis is most important for —

• preventing the nucleus from becoming larger with each cell division

• maintaining the chromosome number during sexual reproduction

• keeping the amount of DNA in the cell at a minimum level

• allowing the growth of the cell without increasing the DNA content

In the human body, the circulatory system transports and delivers substances. Within the cell, which organelle performs a similar function?

• Nucleus

• Golgi apparatus

• Mitochondrion

• Endoplasmic reticulum

Which of these statements is supported by the data shown in the table?

• Most kingdoms are made up of prokaryotic cells.

• All cells have nuclei for control of cell functions.

• Eukaryotic cells vary in covering and in food production.

• Each of the kingdoms has different organelles for metabolism.

Which of the following is an example of a genetically engineered organism?

• A plant that received external DNA to produce natural insecticides

• A new plant variety created by cross-pollination

• Eukaryotic cells vary in covering and in food production.

• A plant that naturally possesses medicinal properties

The above graph shows how dissolved O2 and CO2 levels changed in a pond over a 24-hour period. What caused the decrease in O2 concentration during the night?

• Increased evaporation

• Decreased photosynthesis

• Increased respiration

• Decreased temperatures

According to the graph, addition of the enzyme amylase causes the reaction to —

• slow down

• speed up

• give off heat

• take in heat

Which of these segments could be used to correctly complete the DNA molecule in the diagram above?

• 
• 
• 
• 

The processes of photosynthesis and respiration can be thought of as a cycle because —

• one is used only by plants and the other is used only by animals

• both give off oxygen to be used by animals

• the products of one are used as the raw materials of the other

• they both have the same purpose

According to this table, a codon AGC is the code for which amino acid?

• Cysteine (Cys)

• Leucine (Leu)

• Serine (Ser)

• Tyrosine (Tyr)