Test 1 Flashcards
Which of the following organisms is a producer?
Diatoms
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
Which of the following is a characteristic commonly found in ciliates?
They are often multinucleate.
Which of the following processes can be effective in preventing the onset of viral infection in humans?
getting vaccinated to certain viruses
What clade does Giardia Intestinalis fall under and what does it cause? (Hint: Excavata supergroup)
Diplomonads; intestinal infections (mammals)
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 statements is accurate with regard to the life cycle of mosses?
Antheridia and archegonia are produced by gametophytes.
Recently, a microbe that is able to digest cellulose was discovered in a hot spring with an average temperature of 95°C. This microbe most likely belongs to which of the following groups?
Archaea
What is the kind of protist that combine photosynthesis and heterotrophic nutrition?
Mixotrophs
Reinforced, threadlike pseudopods that can perform phagocytosis are generally characteristic of which of the following groups or organisms?
Foramifera
Which of these structures produce spores?
sporophyte (capsule) of a moss
Which of the following is a similarity between bryophytes and seedless vascular plants?
In both groups, sperm swim from antheridia to archegonia.
The virus genome and viral proteins are assembled into virus particles during which of the following parts of the reproductive cycle?
The lytic cycle only
Which two genera have members that can evade the human immune system by frequently changing their surface proteins?
Plasmodium and Trypanosoma
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
A process that cannot produce genetic variation in bacterial populations is ________.
Meiosis
What line of evidence would support a hypothesis that a newly discovered bacterium is a cyanobacterium?
It is able to form colonies and produce oxygen.
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
If a viral host cell has a mutation that interferes with the addition of carbohydrates to proteins during processing in the Golgi apparatus, which of the following processes is most likely to occur?
Viruses released by that cell would have a decreased ability to infect cells than the virus that originally infected the cell.
Which of the following biological molecules contributes to the structural integrity of plant spores?
sporopollenin
Which of the following characteristics correctly describes retroviruses?
They have a single-stranded RNA that acts as a template for DNA synthesis.
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
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 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
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.
Which of the following statements about stomata is correct?
Stomata allow gases to diffuse into and out of the plant.
Which of the following characteristics is found in heterosporous plants?
two types of sporophylls
A biology student hiking in a forest discovers an erect, 15-centimeter-tall plant that bears microphylls and a 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.
What type of plant has this student most likely discovered?
lycophyte sporophyte
Living organisms can be divided into two groups: autotrophs and heterotrophs. How do these two groups differ?
Their sources of carbon
