Exam 1 Flashcards
Recently, a microbe that is able to digest cellulose was discovered in a hot spring with an average temperature of 95 degrees celsius. This microbe most likely belongs to which of the following groups?
Archaea
Which of the following characteristics correctly describes retroviruses?
They have a single-stranded RNA that acts as a template for DNA synthesis
Which of the following biological molecules contributes to the structural integrity of plant spores?
sporopollenin
A process that cannot produce genetic variation in bacterial populations
meiosis
Which of the following organisms is a producer?
diatoms
which of the following statements correctly describes one difference between green algae and land plants?
green algae are often unicellular, while land plants are not
in a recent study, researchers found that carbon dioxide was pumped to the ocean floor after adding a small amount of iron to the water. which of the following organisms was likely responsible for this result?
diatoms
which of the following characteristics is found in heterosporous plants?
two types of sporophylls
which of the following statements correctly describes a difference between viruses and prions
viruses replicate using its host’s DNA replication machinery, whereas prions replicate using host’s translation machinery
which of the following is a similarity between bryophytes and seedless vascular plants?
in both groups, sperm swim from antheridia to archeogonia
which of the following traits do archaeans and bacteria have in common?
lack of a nuclear envelope and presence of circular chromosome
which of the following is a characteristic commonly found in ciliates?
they are often multinucleate
which two genera have members that can evade the human immune system by frequently changing their surface proteins?
plasmodium and trypanosoma
a bacterium has the following characteristics:
- it adheres to the human intestinal lining using a feature that protects it from phagocytes, bacteriophages, and dehydration
- it can survive being boiled
- it contains no plasmids and relatively little peptidoglycan
which of the following characteristics allows this bacterium to adhere to the intestinal lining?
fimbriae
which of the following statements correctly describes exotoxins and endotoxins produced by various bacteria?
exotoxins are secreted into the environment while the bacteria is still alive
you are hiking in a forest and come upon a mysterious plant which you determine is either a lycophyte sporophyte, or a monilophyte sporophyte. which of the following characteristics would be most helpful in determining the correct classification of the plant?
whether it has microphylls or megaphylls
while examining a rock surface, you have discovered an interesting new organism. which of the following criteria will allow you to classify the organism as belonging to bacteria but not archaea or eukarya?
cell walls are made primarily of peptidoglycan
what clade does giardia intestinalis fall under and what does it cause? (hint: excavata supergroup)
diplomonads, intestinal infections (mammals)
reinforced, threadlike pseudopods that can perform phagocytosis are generally characteristic of which of the following groups or organisms?
foramifera
which of the following processes can be effective in preventing the onset of viral infection in humans?
getting vaccinated to certain viruses
which of these structures produce spores?
sporophyte (capsule) of a moss
a biology student hiking in the forest discovers an erect, 15 centimeter tall plant that bears microphylls and strobili at its tallest point. when disturbed, the cone emits a dense cloud of brownish dust. observing a sample with a magnifying glass reveals the dust to be composed of tiny spheres with a high oil content.
lycophyte sporophyte
what is the kind of protist that combine photosynthesis and heterotrophic nutrition?
mixotrophs
a type of bacteria colonizes on the surface of a leaf, where it obtains nutrition from the leaf’s nonliving, waxy covering without harming the plant, and inhibits the growth of other microbes that are plant pathogens. if this bacteria gains access to the inside of a leaf, however,, it causes a fatal disease in the plant. once the plant dies, the bacterium and its offspring decompose the plant. what is the correct sequence of ecological roles played by the bacterium in the situation described here?
mutualist, pathogen, nutrient recycler
