unit 1 wuestions
Which of the following statements about the Bacteria and Eukarya domains is true? All members of Bacteria acquire nutrients via ingestion and all members of Eukarya acquire nutrients by photosynthesis. Only members of Eukarya have the ability to grow and reproduce. All members of Bacteria are single-celled and all members of Eukarya are multicellular. All members of Bacteria are prokaryotic cells and all members of Eukarya are eukaryotic cells.
All members of Bacteria are prokaryotic cells and all members of Eukarya are eukaryotic cells.
To test the effect of vitamin D on growth, two groups of rats were raised under identical conditions and fed the same diet. One of the groups received daily injections of vitamin D. The other group received injections of saline, which did not contain vitamin D. All the rats were weighed weekly for 2 months. In this experiment, the control was the group receiving saline. 2-month period of time. group receiving vitamin D. average weight gain of the rats.
group receiving saline.
The main difference between an autotroph and a heterotroph is how they respond to stimuli. how they obtain energy. their ability to move. how they reproduce.
how they obtain energy.
A basic difference between a prokaryotic cell and a eukaryotic cell is that the prokaryotic cell lacks a nucleus. possesses membrane-bound organelles. is considerably larger. is structurally more complex. lacks DNA.
lacks a nucleus.
After you drink a glass of acidic lemonade, your body's pH does not change. This is an example of how humans and other organisms evolve in response to the environment. maintain precise internal conditions. maintain cellular organization. are immune to weak acids.
maintain precise internal conditions.
Errors or changes in the DNA of an organism are called ________.
mutations
The three natural processes that underlie evolution are genetic variation, inheritance, and ________.
natural selection
A group of similar, interbreeding individuals that live in the same area is a(n) ________.
population
he concept of evolution is based on any type of genetic variation within a population. inheritance of variations by offspring of parents with the variations. survival and successful reproduction in organisms with favorable variations. all genetic variation in a population being equally successful in the same environment.
survival and successful reproduction in organisms with favorable variations.
Adaptations aid in the survival and reproduction of an organism in a particular environment. True or False?
true
Photosynthetic bacteria are examples of autotrophs. True or False?
true
Which of the following levels of organization is the most inclusive (that is, includes the most life-forms)? Ecosystem Population Biosphere Community Organ system
Biosphere
Consider the observation that people taking Drug X for headaches also seem to have low blood pressure. Design a simple experiment based on this observation, and include a hypothesis statement and your actual experimental design for the study.
I have ten people that need medication for headaches and I create two groups. Group A receives Drug X, and Group B receives a sugar pill. After five days of taking the medication, I will have checked their blood pressure each day and compare my results. My hypothesis is that the people taking Drug X will have lower blood pressure than those taking the sugar pill.
We use the scientific method every day. Imagine that your car doesn't start one morning before school. Which of these is a reasonable hypothesis regarding the problem? I should check whether the lights were left on and drained the battery. I should change the battery or the starter. I should add a quart of oil. I'm going to be late. I'm out of gas.
I'm out of gas.
Which of the following is an example of deductive reasoning? All objects on Earth will fall down when dropped, and none will "fall up." Living objects are composed of cells. If an object exhibits all the characteristics of life, it must be living. Atoms make up molecules, which make up cells, which make up tissues.
If an object exhibits all the characteristics of life, it must be living.
Alexander Fleming observed a colony of mold that inhibited the growth of nearby bacteria. Which of the following was his hypothesis? The bacteria changed their DNA when growing near the mold. The mold produced a substance that killed nearby bacteria. The mold was dead. The mold used all of the nutrients so that the bacteria couldn't grow.
The mold produced a substance that killed nearby bacteria.
For the following question(s), choose the characteristic of a living organism that best corresponds to each statement. Selections may be used once, more than once, or not at all. A. Growth B. Reproduction C. Maintaining precise internal conditions D. Evolution E. Response to stimuli
a
Photosynthetic plants are considered "self-feeders," or ________.
autotrophs
In a word, "evolution" means change. nature. selection. improvement.
change
Chromosomes are made of cells. carbohydrates organelles. deoxyribonucleic acid.
deoxyribonucleic acid.
Which group has prokaryotic individuals? Domain Archaea Kingdom Animalia Kingdom Plantae Protist kingdoms Kingdom Fungi
domain archaea
For the following question(s), choose the characteristic of a living organism that best corresponds to each statement. Selections may be used once, more than once, or not at all. A. Growth B. Reproduction C. Maintaining precise internal conditions D. Evolution E. Response to stimuli
e
A change in the genetic makeup of a species over time is called evolution. natural causality. adaptation. mutation.
evolution
A good experiment should include as many variables as possible at the same time. True or False?
false
Prokaryotic cells are distinguishable from eukaryotic cells by having a nucleus True or False?
false
