Living environment regents questions

A finite resource in the environment that keeps a population from steadily increasing is known as

A limiting factor

A scientist plans to cut a segment of DNA so that it can be inserted into the DNA of a bacterium, a single-celled organism. The scientist needs to use a special type of organic molecule to perform this cutting process. This molecule is?

An enzyme

Bacteria and humans are similar in that they both

Contain genetic material

An ecosystem is self sustaining as long as organisms have sufficient quantities of energy, oxygen, minerals, and water, when organisms die, some of these materials are recycled back to plants in the ecosystem primarily through the activity of ?

Decomposers

Which statement best describes how a major change in the size of one population affects an ecosystem?

It could directly or indirectly affect the physical conditions and any population.

Which cell structure is mainly responsible for releasing energy from food molecules in some single called organisms?

Mitochondrion

Which group consists entirely of organic molecules ?

Protein,starch,fat

During gas exchange, the cell membrane of a single called organism has the same function as which organ system in humans

Respiratory

Wildflowers grow and reproduce during the spring snowmelt in the desert region of Death Valley, California. Which environmental factor would most likely have the greatest influence on these activities?

amount of time that water is present

Aphids, small insects that feed on the sap of plants, undergo asexual reproduction during the summer months. They produce eggs that are formed without the separation of chromosomes. These eggs do not need to be fertilized, and all of the resulting offspring are female.

asexual reproduction produces offspring that are genetically identical to the parent

Potato farmers in Ireland during the mid 1800s all grew the same type of potato. The potato plants were all produced as clones of one another. When a fungus infected the crop, all of the potatoes were destroyed. This occurred because these potato plants

had little genetic variability

Which sequence represents structures organized from least complex to most complex

nucleus → nerve cell → brain → nervous system

Even though human proteins are synthesized from only 20 different amino acids, there are thousands of different proteins found in human cells. This great variety of proteins is possible because the

sequence and number of amino acids can be different in each protein